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Finding the Fourth Proportional to 859.75, 1,186.31 and 486.61

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Solution

The fourth proportional to 859.75, 1,186.31 and 486.61 is: 671.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.75 : 1,186.31 = 486.61 : x
  2. Step 2: Convert to fraction form
    859.75/1,186.31 = 486.61/x
  3. Step 3: Cross multiply
    859.75x = 1,186.31 × 486.61
  4. Step 4: Simplify right side
    859.75x = 577,268.56
  5. Step 5: Solve for x
    x = 577,268.56/859.75
  6. Step 6: Final answer
    x = 671.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.